council. are you worried about an accidental war in the region >> translator: no, we are acting professionally the americans, we advise them not to act unprofessionally and act with wisdom in the region. >> the good news is we are acting with wisdom we have conducted our middle east strategy and our work with iran to say, nope, you can't conduct assassination campaigns in europe, you can't conduct terror efforts from all across the middle east. >> and late tonight, pompeo warned the u.s. will take action against iranian oil tankers if they are in violation of u.s. sanctions. and on another global front tonight, russia is facing new questions over the recent explosion at a missile testing site after telling a nuclear monitoring group to stay out of it we get more from nbc's bill neely. >> reporter: a growing mystery tonight about exactly what happened days after a nuclear explosion that killed five russian nuclear scientists